Tooth-point construction



July 25, 1939. l w PAGE 2,167,425

TOOTH-POINT CONSTRUCTION Filed Dec. 22, 1938 ]0 %rz; j aye, j wwwz gk I;

Patented July 25, 1939 TOOTH-POINT CONSTRUCTION John W. Page, Chicago, 111., assignor to Page Engineering Company, Chicago, 111., a corporation of Illinois Application December 22, 1938, Serial No. 247,273

6 Claims.

This invention relates to improvements in tooth point construction and more especially such construction adapted for excavating shovels. My invention is adapted, for example, for use in connection with excavating shovels, buckets, dredges and other excavating devices. The construction here shown is applicable for use in connection with teeth commonly used on the forward or cutting edge of excavating shovels and similar devices of the character referred to.

Among the features of my invention is a provision of tooth point construction having a detachable blade. By means of this construction, the blade may easily be removed for renewal, replacement, repair or other purposes. Another feature of my invention is the particular shape and construction of the blade and the means for removably securing it to the tooth point.

Other features and advantages of my invention will appear more fully as I proceed with my specification.

In that form of device embodying the features of my invention shown in the accompanying drawing- Fig. 1 is a top plan view; Fig. 2 is a vertical sectional view; Fig. 3 is a fragmentary view in side elevation; and Figs. 4 and 5 are views taken as indicated by the lines 4 and 5 respectively of Fig. 2.

As shown in the drawing, l8 may indicate the cutting edge of the bottom of a shovel, said edge carrying a plurality of tooth supporting stubs or lugs i 3, one being shown in the drawing. These lugs may be mounted in any suitable manner. For example, as here shown, each lug may be attached to the cutting edge iii of the shovel by means of the upper and lower parallel arms l6 and I1, respectively.

N) indicates a tooth point on the lug l3. As here shown the tooth point is made detachable and provided with a socket adapted to embrace and receive cooperatively the lug I3. Obviously, however, the tooth point l could be supported on the lug l3 or directly on the cutting edge I8 in any suitable manner. If desired, for example, the'tooth point could be made integral with the cutting edge.

Any suitable means may be provided for attaching and securing the tooth point H) to the lug l3. For example, as here shown, the upper surface of the lug I3 is provided with a groove 25 adapted to accommodate the bolt 26. A short distance above and back of the upper and inner end of the groove 25, the lug I3 is recessed at 21 to accommodate the nut 26a of the bolt 26. A circular hole 28 forms a continuation of the groove 25 into the recess 21. The bolt 26 is provided with a countersunk head 26b adapted to seat in the countersunk opening II in the tooth point I.

When the parts are in the position shown in Fig. 2, it is obvious that tightening of the nut 26a will draw the tooth point I0 tightly up on the lug l3.

The forward end of the tooth point I0 is arched and its upper and side surfaces depressed or recessed as indicated by 29, the rear end of the depression terminating in the shoulder 30.

40 indicates an arched detachable blade made of any suitable metal depending upon the usage to which it is to be subjected. Themetal also may be treated or tempered, as desired. That is, it may be hardened or otherwise treated to give it the desired characteristics adapting it particularly for the use to which it is to be put. The blade 40 is carried by the tooth point mounted on the forward arched portion of said tooth point. The blade 40 is arched or curved to conform to the curvature of the arch 29 at the forward end of the tooth point I0; and its ,rear edge lies against the shoulder 30. The forward edge of the blade 40 is here shown as bevelled, as indicated by 400 to provide the sharpened or. cutting edge Mb. I

The blade 4|] is held in place by welding at the edges as indicated by ll. This welding is so put on so that it can easily be undone or removed by a torch, grinder, or other means to permit quick and easy removal, substitution or replacement of the blade. By this construction a plurality of blades of different characteristics may 35 be at hand so that they can readily be changed for different uses. Also, any blade may be quickly removed after wear, for replacement, repair, sharpening or other alteration.

I have found that the blade may be made of 0 sheet metal. This is easily accomplished because of the particular shape of the blade shown.

While there are shown and described certain embodiments of the invention, it is to be understood that it is capable of many modifications. Changes, therefore, in the construction and arrangement may be made without departing from the spirit and scope of the invention as disclosed in the appended claims, in which it is intended to claim all novelty inherent in the invention as edge and provided with an arched forward porticn, the axis of the arch extending longitudinally of the point, and a detachable arched blade carried by the tooth point mounted on said arched portion. 7 2. Apparatus as claimed in claim 1, in which the forward edge of the blade extends beyon the forward edge of the tooth point. v

3. In combination with the cutting edge of an excavating device, a tooth point on said cutting edge and provided with a. depressed arched forward portion, the axis of the arch extending longitudinally of the point, and a detachable arched blade carried by the tooth point mounted on said arched portion.

4. Apparatus as claimed in claim 3, in which the forward edge of the blade extends beyond the forward edge of the tooth point.

5. In combination with the cutting edge of an excavating device, a tooth point on said cutting edge and provided with'a depressed arched forward portion terminating in a shoulder at the back, the axis of the arch extending longitudinaily of the point, and a. detachable arched blade carried by the tooth point mounted on said arched portion with its rear edgeagainst said shoulder.

6. In combination with the cutting edge of an excavating device, a tooth point on said cutting edge and provided with an arched forward portion,the axis of the arch extending longitudinally of the point, and a detachable arched blade carried by the tooth point mounted on said arched portion and held in position by welding, said welding adapted for ready undoing to per- JOHN W. PAGE. 

